Heat recovery unit



FIG. 1 is a top view of an exemplary embodiment of a heat recovery unit according to the present invention.

FIG. 2 is a front view of the heat recovery unit illustrated in FIG. 1.

FIG. 3 is a bottom view of the heat recovery unit illustrated in FIG. 1.

FIG. 4 is a isometric view of the heat recovery unit illustrated in FIG. 1.

FIG. 5 is a rear view of the heat recovery unit illustrated in FIG. 1.

FIG. 6 is a right side view of the heat recovery unit illustrated in FIG. 1; and,

FIG. 7 is a left side view of the heat recovery unit illustrated in FIG. 1. 

The ornamental design for a heat recovery unit, as shown and described. 